Optimize Docker image build

Author: edoardob90

.dockerignore

@@ -0,0 +1,4 @@
+.git
+slides/
+.DS_Store
+__pycache__/

Dockerfile

@@ -1,52 +1,42 @@
 # Use the jupyter/minimal-notebook as the base image
 FROM quay.io/jupyter/minimal-notebook:latest
 
-# Set a shortcut to the tutorial name
+# Set environment variables for the tutorial and repository
 ENV BASENAME="python-tutorial"
-ENV REPO="https://github.com/edoardob90/${BASENAME}"
-
-# Set the working directory to the home directory of the notebook user
-WORKDIR ${HOME}
-
-# Clone the tutorial repository
-RUN git clone \
-    --branch main \
-    --depth 1 \
-    ${REPO}
-
-# Set the working directory to the repository directory
-WORKDIR ${BASENAME}
+ENV REPO=${HOME}/${BASENAME}
+ENV IPYTHONDIR="${HOME}/.ipython"
 
-# Switch to root user to install additional dependencies (if needed)
+# Switch to root user to install additional dependencies
 USER root
-
-# Install additional dependencies
 RUN apt-get update && \
     apt-get install -y --no-install-recommends \
     build-essential \
     gcc \
     g++ \
-    libffi-dev \
-    && \
+    libffi-dev && \
     apt-get clean && \
     rm -rf /var/lib/apt/lists/*
 
 # Switch back to the default notebook user
 USER ${NB_UID}
 
-# Create the Conda environment defined in environment.yml
-# COPY --chown=${NB_USER}:${NB_GID} docker/environment.yml docker/environment.yml
-RUN mamba env update -n base -f docker/environment.yml && \
+# Set up the Conda environment
+COPY docker/environment.yml /tmp/environment.yml
+RUN mamba env update -n base -f /tmp/environment.yml && \
     mamba clean --all -f -y && \
     fix-permissions "${CONDA_DIR}" && \
     fix-permissions "/home/${NB_USER}"
 
-# Copy the IPython configuration file (binder/postBuild script)
-RUN mkdir -p ${HOME}/.ipython/profile_default && \
-    cp -a binder/ipython_config.py ${HOME}/.ipython/profile_default/
+# Prepare IPython configuration (move earlier in the build)
+RUN mkdir -p ${HOME}/.ipython/profile_default
+COPY --chown=${NB_UID}:${NB_GID} binder/ipython_config.py ${HOME}/.ipython/profile_default/
 
-# Set the environment variable IPYTHONDIR
-ENV IPYTHONDIR="${HOME}/.ipython"
+# Copy the repository late in the build process
+RUN mkdir -p ${REPO}
+COPY --chown=${NB_UID}:${NB_GID} . ${REPO}/
+
+# Set the working directory to the repository
+WORKDIR ${REPO}
 
 # Use the default ENTRYPOINT from the base image to start Jupyter Lab
 ENTRYPOINT ["tini", "-g", "--", "start.sh"]